Flagyl, Flagyl ER, and Flagyl Injection (metronidazole) and Cipro (ciprofloxacin) are antibiotics used to treat bacterial infections. Flagyl and Cipro are different types of antibiotics. Flagyl is a nitroimidazole antibiotic and Cipro is a quinolone antibiotic.

Bactrim (sulfamethoxazole and trimethoprim) is a combination of two antibiotics (a sulfa drug and a folic acid inhibitor) and Cipro (ciprofloxacin) is a quinolone antibiotic. Both drug are used to treat bacterial infections such as urinary tract infections, bronchitis and other lung infections. Bactrim is also used to treat ear infections (acute otitis media), Shigellosis, Pneumocystis pneumonia, traveler's diarrhea, and methicillin-resistant Staphylococcus aureus (MRSA). Cipro is also prescribed to trea...